Turbo mill



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flTfOA /VEYS' United States Patent 3,093,328 TURBO MILL h Iarx Law, Scottsdale, Ariz. {P.O. Box 1382, ihoenix, Ariz.) Filed Get. 6, 1961, Ser. No. 143,397 1 Claim. (1. 24-1--55) This invention relates to a pulverizer, and more particularly to a means for pulverizing and subsequently separating fine and coarse material so that the coarse material can be returned to the pulverizer for additional crushing, grinding or the like.

The primary object of the present invention is to provide an attrition pulverizer which is adapted to be used for grinding various types of materials and wherein the materials being handled or ground can be pulverized or ground with minimum cost and wherein the material can be ground or pulverized to any desired mesh, the pub verizer of the present invention being constructed so that it has a minimum weight and wherein the device is convenient to operate and handle.

A further object is to provide an attrition pulverizer which is constructed so that the plus materials or coarse materials are automatically returned to the pulverizer to be regro-und, and wherein the present invention can be used for grinding various types of materials such as friable materials as well as metallic ores and non-metallic materials, the mill of the present invention permitting use thereof as a permanent installation or else the device can be made portable, and wherein the mill has a dual feed or inlet arrangement so that materials will be fed uniformly into the attrition chamber in order to provide the most uniform mesh for the materials being pulverized or ground.

Still another object is to provide such a pulverizer that is economical to manufacture and eificient in operation and which is rugged in structure and foolproof in use.

These and other objects of the invention will become apparent from a reading of the following specification and claim, together with the accompanying drawings, wherein like parts are referred to and indicated by like reference characters and wherein:

FIGURE 1 is a side elevational view of the attrition pulverizer of the present invention, and with parts broken away and in section,

FIGURE 2 is a side elevational view showing the opposite side from that shown in FIGURE 1 and with the hopper removed and with parts broken away and in section.

FIGURE 3 is an end e-levational view of the pulverizer of the present invention.

FIGURE 4 is a plan view of one of the hoppers removed from the machine.

FIGURE 5 is a sectional view taken on the line 5-5 of FIGURE 3.

FIGURE 6 is an enlarged sectional view taken on the line 66 of FIGURE 3.

FIGURE 7 is a sectional view taken on the line 77 of FIGURE 6, and with parts broken away.

FIGURE 8 is a sectional view taken on the line 88 of FIGURE 2.

FIGURE 9 is a sectional view taken on the line 99 of FIGURE 3.

FIGURE 10 is a sectional view taken on the line 1ll1tl of FIGURE 3, and with the anvil partially removed.

FIGURE 11 is a sectional view taken on the line 1111 of FIGURE 10.

FIGURE 12 is a detail section taken through the anvil and showing one edge portion thereof being worn.

FIGURE 13 is a view similar to FIGURE 12 but with the anvil in a reverse position from that shown in FIG- URE 12 to bring the unworn surface into operative position.

FIGURE 14 is a fragmentary top plan view of the anvil.

Referring in detail to the drawings, the numeral 20 indicates the pulverizer or mill of the present invention which is shown to include a base that is indicated generally by the numeral 21, and the base 21 may embody or include a pair of spaced parallel horizontally disposed beams 22, FIGURE 3, and a horizontally disposed plate 23 is adapted to be secured as by welding to the beams 22. Angle irons 24 are adapted to be secured as at 25 to the plate 23, and the numeral 26 indicates a hollow housing which includes a lower section 27 that is suitably affixed or secured between the angle irons 24. As shown in the drawings, the lower section of the housing includes spaced parallel vertically disposed side walls 28 and 29 as well as spaced parallel vertically disposed end walls 30 and 31. There is provided openings 32 in the side walls 28 and 29, and hoppers 33 are adapted to receive material to be pulverized or ground from a suitable source of supply, and chutes or troughs 34 are provided for conveying the material from the hoppers 33 to the openings 32. A stationary casing 36 has an impeller 35 rotatably arranged therein, and there is provided in the upper portion of the casing 36 a discharge opening 39 for a purpose to be later described.

As shown in the drawings, the impeller 35 further includes a rotary hub 40 which has a plurality of radially disposed arm-s 41 suitably affixed thereto, and the arms 41 are arranged in pairs, and blades or paddles 42 are suitably affixed to each pair of arms 41. The numeral 43 indicates a driven shaft which is adapted to be affixed or keyed as at 44 to the hub 41 and a sheave or pulley 45 is suitably connected to the shaft 43, FIGURE 1. The numeral 46 indicates a drive shaft which is spaced from the shaft 43, and the sheave or pulley 47 is suitably mounted on the shaft 46, and an endless belt 48 is trained over the sheaves 45 and 47, and the numeral 49 indicates a guard or protective device which surrounds the belt 48 and rotating sheaves 45 and 47. As shown in the drawings the sheave 47 is of considerably larger diameter than the sheave 45, so as to help insure that the impeller 35 can be rotated or driven at a very high speed. The shaft 46 may be suitably connected to a motor or other power source for rotating the shaft 46 and associated parts.

The housing 26 further includes an upper section or stack 50 which has a hollow interior that defines or provides an attrition chamber 51, and the numeral 52 indicates a removable and reversible anvil which is mounted in the housing above the impeller 35. As shown in FIG- URES 10 and 11 for example, the anvil 52 includes stationary inclined tracks or rails 54 which are secured within the housing, and there is provided an opening 53 in an end of the housing for permitting the anvil to be withdrawn or replaced, and the anvil includes spaced parallel sidernembers 55 which are adapted to slidably engage the tracks 54. A plurality of spaced parallel bars 56 extend between the side members 55 and are suitably secured thereto as by welding so that this arrangement of bars and-side members defines or provides a grid. As

shown in FIGURE 12, end portions as indicated by the numeral 58 of the bars 56 may become worn and wherein the opposite or upper end portions of the bars may remain somewhat pointed or tapered as at 57, so that after such wear takes place, the anvil 52 may be removed through the opening 53 and turned upside down or reversed so as to cause the parts to return to the position shown in FIGURE 13 wherein the pointed end portions 57 will be downwardly in order to help insure that the material passing therethrough will be acted on in the most efiicient or desired manner. The numeral 59 indicates a plate that is adapted to be suitably secured to an end of the anvil 52, and the plate 59 may be secured by a securing element or bolts 60 to the anvil or grid. When the anvil is in place in the housing, the plate 59 may be secured as at 61 to the adjacent end wall of the housing in order to help maintain the anvil in its proper position above the impeller.

There is further provided a discharge chute 62 which is partially defined by an inclined top wall 63 and a slanting wall member 64, and the slanting wall member 64 is arranged in spaced parallel relation below the top wall 63, FIGURE 1. There is defined or provided in the lower portion of the wall member 64 an opening 65, and the numeral 66 indicates an adjustable damper mechanism which is adapted to be adjusted for controlling the flow of material out from the attrition chamber 51 into the lower portion of the chute 62. The damper mechanism 66 includes a pivotally mounted baffle or plate 67 which is connected to a pivot rod or pin 68, FIGURE 8, and the pivot rod 68 is supported in bearing members or blocks 69 which are suitably 'aflixed on the outer portion of the housing, and the numeral 70 indicates an arm or lever which is connected to the pivot rod 68. The lever 70 is provided with a pointer 71 on one end thereof, and the pointer 71 is adapted to coact with calibrations or scale markings 72 on a plate member or base piece 73, and the base piece 73 is suitably afiixed to the outer portion of the housing 26. The member 73 is provided with an arcuate slot 74, and the numeral 75 indicates a securing element or set screw which extends through the slot 74 and which is connected to the movable lever 70, and the set screw 75 may be loosened when the lever 70 is to be adjusted. Similarly, after the lever 70 has been moved to its desired adjusted position, the set screw 75 can be tightened in order to maintain the bafile plate 67 immobile in its desired adjusted position.

As shown in the drawings there is provided a return mechanism 76 wherein coarse material can be returned to the mill to be reground, and the return mechanism 76 is arranged contiguous to the upper portion of the chute 62 adjacent the lower surface thereof, and the return mechanism 76 includes an inclined wall section 77 that has a plurality of spaced parallel slots 78 therein, and a compartment or chamber 79 is defined below the wall section 77, and the bottom of the compartment or chamber 79 is defined by an inclined wall piece 80. The numeral 81 indicates a pipe or conduit which depends from the wall piece 80, and the pipe 81 is arranged in engagement with or in communication with the lower portion of the compartment 79, and a vacuum tube 82 is connected to the pipe 81, and the vacuum tube 82 is adapted to be connected to a suitable source of vacuum pressure.

The shaft 43 for the impeller 35 is adapted to be supported by bearings 83, and the bearings 83 may be suitably mounted on support members 84, FIGURE 3.

The numeral 85 indicates a clean-out plate which may be detachably connected to the lower portion of the housing as at 86, so that for example by removing the elements 86, the plate 85 can be removed in order to provide a means for cleaning out the lower portion of the mill in the event the same requires such work to be done.

As shown in FIGURES 6 and 7 there is provided adjacent the lower end of the compartment 79 a bottom piece or wall 87 which has a generally V-shape so that with the apex of the wall 87 contiguous to the upper end of the pipe 81, the coarse material which falls down through the slots 78 will be guided into the pipe 81.

In FIGURE 2 the numeral 88 indicates a portion of an air classifier which is shown and described in detail in my co-pending patent application, Serial No. 144,413 filed October 11, 1961, and this air classifier 88 is adapted to be connected to the upper end of the chute 62.

From the foregoing, it is apparent that there has been provided an attrition pulverizer, and in use with the parts arranged as shown in the drawings, it will be seen that the material such as ore or the like which is to be ground or pulverized is adapted to be supplied from a suitable source of supply and this material is fed into the pair of hoppers 33, FIGURE 3. The material to be pulverized moves downwardly through the tube 34 by gravity, and this material enters the bottom of the housing 26 through the openings 32. With the shaft 46 being driven by a suitable power source such as an engine, motor or the like, it will be seen that the shaft 46 will be rotated to turn the sheave 47, and with the belt 48 trained over the sheave 47 and also trained over the sheave 45, and with the sheave 45 fixedly mounted on the shaft 43, it will be seen that this rotation of the shaft 46 will cause corresponding rotation of the shaft 43. The shaft 43 is adapted to be driven at a very high speed, and by using a sheave 45 of a smaller diameter than the sheave 47, the desired high speed of the shaft 46 can more easily be brought about. As the shaft 43 rotates, it turns the impeller 35 since the hub 40 of the impeller is keyed as at 44 to the shaft 43, and as the impeller 35 revolves in the stationary casing 36, it will be seen that the arms 41 will rotate the blades 42 to help pulverize the material which has entered the casing 36 through the openings 32. It is to be noted that the casing 36 consists of the plates or wall sections 37 which have end portions thereof arranged in overlapping relation as at 38 and this overlapping construction helps insure that the desired amount of pressure will be exerted on the material such as the ore whereby the most efiicient pulverizing action will take place. As the blades 42 revolve in the stationary casing 36, they pick-up or throw out some of the ground or pulverized material up through the opening 39 which is provided in the upper end of the casing 36, and the impeller 35 is adapted to be rotated at a very high speed in order to cause the desired action to take place. The material which is thrown upwardly to the opening 39 is moved into engagement with the anvil 52, and some of this material finds its way through the space between the bars 56 of the anvil 52. Normally the anvil 52 is removably mounted in the housing, and bolts 61 are adapted to be used for fastening the plate 59 to the adjacent portion of the housing whereby the anvil can be maintained in operative position. The tracks 54 provide a slidable mounting for the side members 55 of the anvil, and normally the lower portions or lower ends of the bars 56 [are somewhat pointed or tapered as indicated by the numeral 57, but after continued use, these lower pointed portions 57 may have a tendency to become dull or blunted or worn as indicated by the numeral 58 in FIGURE 12. When such wear occurs, the bolts 61 can be unfastened or removed whereby the anvil 52 can be pulled out through the opening 53 and reversed or turned upside down so that the pointed upper end portions 57, as shown in FIGURE 12, will now be on the bottom as shown in FIGURE 13 in order to insure that the anvil functions in the most efi'icient manner. After the anvil has been reversed or turned upside down the bolts 61 are again used for holding the anvil in place.

The material which passes upwardly through the spaces between the bars 56 enters the attrition chamber 51 and the material in the attrition chamber rubs together so as to cause the material to exert a pulverizing or grinding action on itself in the attrition chamber 51 whereby the material will be acted upon in such a manner so as to produce pulverized or ground particles of a desired size.

Although the invention herein described is fully capable of achieving the objects and providing the advantages hereinbefore mentioned, it is to be understood that it is merely illustrative of the presently preferred embodiment of the invention and that it is not to be limited to the details of construction herein described other than as defined in the appended claim.

What is claimed is:

A mill comprising a base, a hollow housing including a lower section mounted on said base and said housing including spaced apart end walls and spaced apart side walls, said side walls having inlet openings therein, hoppers connected to said inlet openings; a high speed impeller including a generally circular casing mounted in the lower section of said housing and said casing including a plurality of arcuate overlapping wall members arranged to provide a discharge opening in the upper portion of the casing, said impeller further including a rotary hub having radially disposed arms aflixed thereto, blades iaffixed to said arms, a shaft extending through the lower section of said housing and conneced to said hub; said housing further including an upper section having a hollow interior defining a chamber which communicates with and receives material from the discharge opening of the casing; an anvil supported in the housing above the impeller and said anvil including side members having a plurality of spaced parallel bars secured thereto, each of said bars having a tapering portion adjacent one end, one of the end walls of said housing having an opening therein for the withdrawal and insertion therethrough of the anvil; an inclined chute in the upper portion of said housing and said chute being defined bya top wall and a 6 slanting wall member arranged in spaced parallel relation below said top wall, there being an opening defined in the lower portion of the wall member; an adjustable damper mechanism for controlling flow of material from said chamber through said last named opening into the chute, said damper mechanism comprising a pivotally mounted baffle, a pivot rod afiixed to said bafile, a lever arranged externally of said housing and connected to i References Cited in the file of this patent UNITED STATES PATENTS 2,050,423 Dauber Aug. 11, 1936 2,546,286 Zakel Mar. 27, 1951 FOREIGN PATENTS 1,131,558 France Oct. 22, 1956 

